State Grid Jiangsu electric power company is one of the largest provincial Power Grid Corp of the national Power Grid Corp system. It has 13 cities, 51 counties (cities) companies and related scientific research, maintenance, construction and other units, the number of households 40 million 400 thousand. With 35 thousand volts and above 3066 substations, transformer capacity of 4.75 million KVA, 91 thousand and 100 km of transmission lines. The power grid is larger than Britain, Italy and other countries. The qualified rate of voltage and the ability of resisting risk of power grid have reached the international advanced level. At present, Jiangsu power grid has entered the era of UHV, large power grid and high load.